<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox"  v-model="isAll" />
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydown.enter="downFn"
      v-model="task"
    />
  </header>
</template>

<script>
export default {
  props:['arr'],
  data() {
    return {
      task: "",
    };
  },
  methods: {
    downFn() {
      this.$store.commit('addFn',this.task)
      this.task = ''
      // if (this.task.trim().length === 0) {
      //   alert("任务名不能为空");
      //   return;
      // }
      // this.$emit("create", this.task);
      // this.task = "";
    },
  },
  computed:{
    isAll:{
      set(checked){
        this.arr.forEach(obj =>obj.isDone = checked)
      },
      get() {
        //every口诀: 查找数组里"不符合"条件, 直接原地返回false
        return this.arr.length !== 0 && this.arr.every(obj =>obj.isDone === true)
      }
    }
  }
};
</script>